高性能鋰-二氧化錳電池正極的研究.pdf

1、天津大學(xué)碩士學(xué)位論文高性能鋰二氧化錳電池正極的研究姓名：張晶申請學(xué)位級別：碩士專業(yè)：化學(xué)工程指導(dǎo)教師：黃成德張世杰20071201ABSTRACTLithiummanganesedioxidecellisahighperf：ornlanceschemicalpowersource，andit’soneofthethreekindsofprima巧lithiumcellswhichhaVebeenwidelyusedRecently，re

2、searcherspaymuchattentiontohowtoimproVetheelectrochemicalperfbrnlanceofthissystem，becauseofitsoutstandingadVantages(noobViousVoltagelag，crediblesafety)AsatraditionalactiVematerial，manganesedioxidehasbeenwjdeJyusedincells

3、，butitspropenjesaredi婦’erentbet、Veeno唱aniceJectrolytesandaqueouselectrol”esInthiswork，effectsofthepositiVeelectrode，includesthepositiVeactivematerialofmanganesedioxide，theconductingadditiVeandtheelectrodepreparingtechnol

4、ogyoncharacteristicsoftheelectrodehadbeeninVestigateddetailedlyManganesedioxidewithdif俺rentcrystalstructurehadbeenpreparedbysol—gelprocessandsoIidreactionmethodXRDanalysis，constantcurrentdischa唱emeasurementandotherteStin

5、gmethodswereemployedtostudytheirphysicalandelectrochemicalpropeniesThedischa唱ecapacityofnMn02was2275mAh／gat02mA／cm2，and0【Mn02hadahighercapacity(2598mAh／g)ThechemicalmanganesedioxidesuppIiedbyHunanHailiChemicalIndust巧Co，L

6、td(HLC)showedadischa略ecapacity2685mAh／gat02mA／cm。Thedischa唱ecapacityat02mA／cm2oftheiondopedmanganesedioxidesuppliedbyXiamenUniVersit)，couldreachto28261mAh儋，andsuchmaterialhadahighsmoothVoltageplateauAllofthemmentionedabo

7、VewerepositiVematerialswithbetterelectIochemicalproperticeforlithiummanganesedioxidecellFiVekindsofconductingadditiVeswerecomparedonpowderelectricalconductiVi夠：electricalconductiVi妙oface夠leneblackwasclosetothatofSP；theel

8、ectricalconductiVityofKS15wasaround320Q。msimilartothatofexpandedgraphite；VGCFexhaVitedtheminimalelectricalconductiVity(O6Q‘m)amongthenVematerialsThecellswithmixedconductingadditiVeofacetyleneblackandgraphite(expanded艫aph

9、ite，KS)showedthemaximaldischa唱ecapacityThedischargepropertiesoftheelectrodeswithmixedconductingadditiVeofcarbon6ber(VGCF)andcarbonblackSPwerebetterthanthatwithacetyleneb】ackandexpandedgraphiteat02mA／cm2ThefornleronehadaV

10、oltageplateauabout60mVhi曲erthanthelatterone，anditsdischargetimeincreasedby912hoursWhendischa唱edat5mA／cm2，thedischargecapaci夠propertiesofthefo硼eronewereimproVedobViousIy：thedischa唱eVoltageplateauincreasedabout1OOmVthanthe